Screw pencil



June 29, 1937.

K. V. JRGENSEN SCREW PENCIL `Filed Feb. 4, 1955 (III Karl Val clemn'f liars en Sgn {NVENTQ AT1-'v `40 the feederl mechanism by means of Patented June 29, 1957 UNITED .STATES PATENT OFFICE In Denmark February 16, 1934 7 claims. (ci. 12o- 18) The invention vrelates to screw pencils of the kind having a rotary feeder mechanism for advancing leads forward through a hollow point of said pencil. v

The invention has for itsobject to provide a pencil of this kind in which fresh leads can be introduced into the hollow point without opening the magazine for spare leads, butsimply by turning the feeder mechanism backwards.

A further object of the present `invention is t'o provide means, whereby this procedure can be repeated many times as long as spare leads remain in the magazine.

A still further object of the invention is to provide means for attainingv these advantages in such a manner that the leads, in filling up the magazine, have not to be placed in any distinct order, but can be filled in side by side as usually in such pencils,l using a magazine for spare leads.

According to the invention the aforesaid ad-` vantages are obtained without making the use of the pencil more difiicult than the use of an ordinary screw-pencil, and without making` it necessary for the user to make other adjustments 25 or movements with the pencil-parts than ordinary. i

'Further the invention comprises no frail parts, but can be carried out using simple and rigid parts, so that the pencil in accordance with the 30 invention will have a great strength, will be durable in use, and will not be easy to bring out of proper function.

AAccording to the invention, the said advantagesare attained-by using a'spiral guide face 35'in the magazine leading from the wall of the magazine tothe axis of the pencil, and a `slide co-operating with the said guide face, oneof the CTI said parts being firmly attached to the casing of the pencil, while the other one is connected, to a friction coupling or the like.

On-the' drawing is shown by way of exempliflcation but not of limitation, ltwo pencils according to the invention,

Fig. v1 showing alongitudinal section of one construction.

Fig. 2 is a substantially longitudinal sectional View on an enlarged scale'of the upperportion of the pencil.

Fig. 3 is a top plan view-of the pencil with the cap removed.

Fig. 4 is an enlarged sectional-view ofthe Vrotary cap. y

Fig. 5is a sectional view 55 on lines 5-5 `of Figure 4.

of the slit pipe taken Fig. 6 is a longitudinal' sectional view of 'the coupling and associated parts.

Fig. "l is a substantially transverse sectional View of the barrel and magazine taken on lines 'I-I of Figure 1, and' Fig. 8 the bottom end of another construction L of the pencil, inl longitudinal section.

v screwed, which is shown to a larger scale in Figs.

2 and 3. The guide is shaped mainly like a hollow bushing, which by means of a flange 6 can be screwed firmly against the end of the pencil, a pencil clip 1 being inserted between the said parts in a manner known'per se.

On the side of the guide 5'that faces inward', a stop 8 is provided, which is shaped as a stopping lug. I

In the guide 5 a sleeve 9 is loosely inserted, which at the end projecting into the pencil is fitted with a stopping lug I adapted, in a manner further described be10w,to cooperate with the stopping lug 8 ,on the guide 5. In the sleeve 9 a threaded pipe II is attached, which may for instance be producedfby winding a metal strip, in such a manner that a helical channel I2 is formed.

Into the threaded pipe a, slit pipe I3 is inserted; which is shown to alarger scale in Figs. 4-6. 'Ihe slit pipe I3 hasa longitudinal channel I4, andI terminates inside of the pencil in an outward flange I5. To the top end of the slit pipe I3 a cap I6 is attached, by means of which the pipe can be rotated from the outside.

In the slit pipe I3 a feeder rod I'I is inserted, i

which is fitted with a tooth I8 extending through the slit I4 and projecting into the channel I2 of the' threaded pipe II.

Resting against the flange I there is provided, on the slit pipe I 3an outer tubular coupling part I9, which by means of its bottom 20 rests against the flange I5. In the coupling-part I9 a compression spring 2I is inserted, one end of which presses against the bottom 20, whereas the other end presses against an outward flange22 on an internal tubular coupling partl 23, which bymeans of an inward flange 24 supports. the inner end of the threaded pipe II, in

such a manner that the outer couplingl part, with a force dependent on the pressure of the spring part spiral wall, the inner 'winding of which has the same radius as the leads used, and is concentric with'the axis of the pencil.` To the outer coupling part I9 a slide 26 is attached, which in the construction shown is fitted with a pin 21 engaging a corresponding hole in the bottom 20 of lthe outer coupling part I9, and supports la wing 26, which freely can be' swung about the axis of its pivot'pin 21. The slide is disposed eccentrically in relation to the axis of the pencil.

In the construction shown in Fig. 8, the slide l26 has its pin 21 inserted in 'a hole provided in vthe -pencil point 2 eccentrically in relation to the axis of the pencil, and the guide face 25 is firmly attached to the outer couplingpart I9.

Supposing a lead to be contained in the channel 3, and the feeder rod I1 to rest against the inner end of thisA lead, and the magazine 4 to be filled with" leads 29 (in Fig. 2 two loose leads are shown)` it will be possible, by rotating the cap I6 to the right, to turn the slit pipe I3, and thereby, the feeder rod I1, and consequently the teeth la, which engages the he1iee1 charmer I2 in the threaded pipe II, will be pushed forward, and thereby the lead will gradually be` pressed out through the channel 3.

When in this manner the lead has been pushed all'the way out, at the same time `as it has been consumed entirely, the procedure according to the invention is as follows:

:The cap I6 is' turned to the left. Hereby the friction caused by thecoupling yI9-2Lbetween the slit pipe I3 and the threaded pipe II will cause the latter to be rotated to the left together with the sleeve 9. This condition, however, will only last until the stop I0 strikes the stop 9. Then the threaded pipe II will remain stationary, and by a. further rotation to the left of the. slit pipe Ilnthev feeder rod I1 will be moved clear up to the top of the pencil, the tooth I6 finally clicking over the extreme end of the threaded pipe II. As soonas the feeder rod vis heard to click, the same is known to'be screwed entirely home. After this the cap I6, should againbe turned to the right. In the same manner as before, :and caused by the friction-coupling -I9-2I, the threaded pipe VII will at thev start be turned to the right together with the slit pipe I3. Hereby the slide 26 will alsov be turned to the right, and will thereby slide along the guide face 25. Hereby the. said slide will strike the leads 29 contained in the magazine l, and the wing 28 will press the outermost lead into the innermost winding` of the guide face. After this, the slide 26 cannot move any fur ther. By the continued rotation of the cap I6,

the friction in the coupling I9V-24 will therefore l. be overcome, and the threaded pipe I I will therefore stand still, after which the feeder rod I1 will be moved Iforward and will strike the inner end of the lead held in the inner winding'of the guide face 25,` and will push the lead directly into the channel 3 in the point, whereupon al fresh lead has been introduced in the pencil.

This 'action can be repeated,.as longk'as any leads are left in the magazine 4. u f

Th modified construction 4shown in Fig. 8 operates in the same manner. Only the relative motion of the slide 26 and the guide face 25 is in any definite order.V Notwithstanding the great 'a motion at right angles to their longitudinal the pushing mechanism will be adapted to rotate guide face 25 is connected, by means-of the couphng lei-24, to the feeder mechanism, while the slide 26 is stationary in the pencil.

The present invention is distinguished by its 6 great simplicity and ease of operation, and by the feature that no special care is required from the user ofthe pencil, especially because the leads dc-not have to be deposited in the magazine l0 advantage attained by the automatic lling of the pencil, no other .motions have to be made than in'the case of an ordinary screw pencil, in which the inserting of a new lead affords that one single lead has to be shaken out of the opened magazine, and a fresh lead has to be inserted into the channel 3 by hand. Also for such a. pencil the feeder rod I1 has in fact to be screwed back, which is the only motion required by the present device.

The construction may be modified in respect to certain details; Thus especially the coupling 'mechanism may be constructed in other manners than the one shown and described, and similarly the feeder mechanism, which does not form 2?: any part of the invention proper, may be of some other kind than the one shown here by` way of example. It is only necessary that the feeder mechanism used can cause the feeding forward of the lead by a rotation about the axis of the pencil. 'Ihe slide 26 and the guide face'25 may also be produced in other manners, the essential feature being merely that theyguide face should have a central winding in which the leads, byv

axis, can be introduced, and thereby caribe caused to stand co-axially to the axis of the pencil. It should be noted especially that the guide face may be made inA one .with the casing of the pen cil, or may form a ,specialv part of the coupling member I9.

I claim:Y 1. In a screw pencil comprising a tubular casing with a rotary pushing mechanism in the rear portion thereof and the forward portion thereof forming a magazine for spare leads, two cooperating parts to guide the leads comprising a. member having a spiral guide face leading from the wall of saidmagazine to the axis of the pencil, a slide adapted to move relatively along said guide face, a friction connection coupling for attaching one of said two co-operating parts to 'the rotary part of said pushing mechanism.

2. In a'screw pencil comprising a tubular casing'with arotarypushing mechanism in the rear portion thereof andthe forward 'portionKy thereof forming a magazine for spare leads, two cooperating parts to guide the leads comprising a member having a spiral guide face leadingkfrom the wall of said magazine to the axis of the pencil, a slide adapted to move relatively along said guide face, a friction connection coupling for attaching one f of said two cooperating parts to the rotary part of said 'pushing mechanism in such a manner that freely, if the resistance against the relative movement of theI said guide face in relation to the said slide is great.

3.- In a screw pencil comprising a tubular casing with a rotary pushing mechanism in the rear portion thereof and the forward portion thereof forming a magazine for spare leads, two relatively cooperating. members for bringing the leads into the axis of the pencil, consisting of, a member' havingv a spiral guide face leading from thel 75 wall ol said magazine to the axis'of the pencil, and

a slide adapted to move relatively along said guide face, a ilrictioncoupling attaching one of i said relatively cooperating members tothe rotary part of Vsaid pushing mechanism, the other member being attached to the casing of the pe nciI.

r 4. In a screw pencil with a tubular casing 4car-- rying in its rear portion a rotary pushingmechanism comprising a slit pipe with'a push-bar inserted in a threaded pipe and its forward portion forming a magazine for spare leads, two relatively co-operating members for bringing 4the spare leads one after another into the axis of the pencil and consisting in amember having a spiral guide i5 face leading from the outer wall of said magazine to the axis of the pencil and a slide adapted to move along said guide face, onev of said relatively cooperating/members being connectedwtgjherog.

coupling consisting of an outer cylindrical coupling part resting against an outer flange of said slit pipe, a helical spring vplaced in said outer coupling part pressing againstan outer flange on an inner coupling part resting with an inner flange against the end of said threadedpipe, the other of said relatively co-operating members being connected to the casing of the pencil.

5. In a screw pencil, a (1) tubular pencil casing carrying in its rear portion `a rotary push-`Y ing mechanism comprisinga slit pipe with a push' bar inserted in a rotary' threaded pipe and its forward portion forming a magazine for vspare leads, said pencil casinghavlng a tlxedstcp and said threaded pipe bearing a stop to engage said ilxed stop, thereby preventing the threaded pipe from being ,rotated more than one revolution in relation to the penciicasing, `(2) two .cooperating to guide the leads comprising a memberv of said magazine to the axis of the pencil, an eca slide adapted to move relatively along said guide face, and a (3) frictional connection coupling attaching one of said two relatively co'l operating parts with the rotary part of said pushingmechanism.

6. In a screw pencil with a tubularcasing carryingin its rear portion arotary pushing mechanism, a magazine `for spare leads, two cooperating parts to guide the leads comprising a member having a spiral guide face leading from the wall centrically disposed slide,Y adapted to move relatively along said guide race, a friction connection coupling for attaching one of said two relatively co-operating parts to ,the rotary part of said Vpushinglmechanism. l 7. In a screw pencil with a tubular casing with a rotary pushingmgchanismjntherear mrticn tarypushingmeclianism-byfmeans/of a frictional thereoLandtl forward "portion thereof forming a magazine for spare leads, comprising' a thread- 1 ed pipe, a anged slit pipe with a push-bar inserted in said threaded pipe, two relatively cooperating members for bringing the leads into the axis of the pencil consisting in a member having a spiral guide face leading from'the'outer'wall of the said magazine to the axis of the' pencil and .a slide adapted to move along ,said relativelycooperating members to the rotary pushing mechanism, said frictional coupling, Vcomprising an outer. cylindrical coupling part rr-esting against the flangeof said slit pipe, a helical Aspringplaced in said outer coupling part pressing at rone end against the lower end thereof, and an inner coupling part having an outer ilange at its upper end to receive the upper end of the "spring band-'an Y innerjilange atits lower` end against which the 'end of said threaded pipe rests, the other oi said relatively cooperating membersbelng/connected a havingv a sp aigideaealeadinglmmvthelail\to the/casingior the penciLm oi' said ne to the axis of thepencil and 

